8
x
Faults and malfunctions
BA ROTEX HPSU compact 4 - 09/2013
45
Hot water does not warm
up
DIP switch configured incorrectly
●
Have the system checked by a ROTEX heating
technician.
Hot water supply switched off (e.g. time pro-
gram is in the economy phase, parameters for
hot water supply have been set incorrectly).
●
Check the operating mode setting.
●
Check the request parameters.
Storage tank charging temperature too low.
●
Increase the target hot water temperature.
Draw-off rate too high.
●
Reduce the draw-off rate, limit throughput.
Output of heat pump too low.
●
Check the switching times for room heating and hot
water supply for overlaps.
Water volume in system too low
●
Check the water volume and the associated primary
pressure in the expansion tank, if necessary top up
the water and reset the primary pressure.
Optional: Backup heater (BUH) not switched on.
●
Have the system checked by a ROTEX heating
technician.
Room cooling does
not cool
Water flow too low.
●
Check that all stop valves of the water circuit are
completely open.
●
Check that the expansion tank is defective.
●
Bleed system completely.
●
Using the controller (rotary switch position
) check
whether sufficient water pressure (> 0.5 bar) is
available.
●
Have the system checked by a ROTEX heating
technician.
Cooling" turned off (e.g. switching time
programme is in the setback phase, exterior
temperature too low).
●
Check the operating mode setting.
●
Check the request parameters.
●
Check the setting of time a weekday in the control
system.
Refrigerant compressor is not working.
●
Wait until minimum water temperature is reached
(15 °C). At a low water temperature the system may
use the optional backup heater (BUH) first to reach
the minimum water temperature.
●
Have the system checked by a ROTEX heating
technician.
System is in the operating mode "heating".
●
Switch the operating mode to "Cooling".
Cooling effect of
room cooling too little
Water flow too low.
●
Check that all stop valves of the water circuit are
completely open.
●
Check that the water filter is dirty.
●
Check that the expansion tank is defective.
●
Bleed system completely.
●
Using the controller (rotary switch position
) check
whether sufficient water pressure (> 0.5 bar) is
available.
●
Have the system checked by a ROTEX heating
technician.
Water volume in system too low.
●
Have the system checked by a ROTEX heating
technician.
Quantity of refrigerant in the system too low or
too high.
●
Have the coolant level checked by a ROTEX
specialist heating technician. Have him check the
system for leaks.
Malfunction
Possible cause
Possible solution
Summary of Contents for HPSU compact 304
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